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How to Check Blood Oxygen Levels From Pulse Oximeter A2

  • By Pulse Oximeter A2
  • •  Mar 19, 2023

What is the Blood Oxygen Level?

Blood oxygen level is the amount of oxygen your red blood cells are carrying. We express it as a percentage, with a normal range of 95% to 100%. For example, if your blood oxygen level is 98%, that means your blood is carrying 98% of the oxygen it can hold.

Blood oxygen level, also known as oxygen saturation or SpO2, measures the amount of oxygen carried in the red blood cells. It is expressed as a percentage and is an essential indicator of respiratory health. 

What is the Normal Oxygen Level?

Blood Oxygen Level



95%- 100%

Normal reading

Healthy Body

91%- 94%

Insufficient oxygen levels

COVID or other underlying medical issues

< 91%

Low blood oxygen level 

Medical emergency

< 85%


Oxygen deficiency in the brain

< 80%

Severe Hypoxemia

Oxygen deficiency in other vital organs

< 67%


Bluish colour on skin or mucus membrane

What Can Cause Low Blood Oxygen Levels?

If your blood oxygen level drops below 90%, it's considered low and could be a sign of something more serious. However, if you've ever gone on a mountain hike and felt out of breath, that could be because of low blood oxygen levels due to the altitude.

Common causes of blood oxygen levels are:

Medical conditions that can lead to low blood oxygen include:

  • Acute respiratory distress syndrome (ARDS): When your alveoli fill up with fluid, it becomes difficult to absorb oxygen from inhaled air.
  • Anaemia: A deficiency of adequate, healthy red blood cells can decrease oxygen transportation in blood.
  • Asthma: Excess mucus production reduces the volume of inhaled air and oxygen.
  • Bronchitis: Bronchi produce mucus to fight infection, but it results in lower air inhalation.
  • Chronic obstructive pulmonary disease (COPD): Blocked airways inhale less oxygen, and thus there's hypoxemia. 
  • Congenital heart defects: The heart's optimum working is reduced which affects oxygen intake.
  • Congestive heart failure: Irregular pumping can back up blood in the lungs from the heart. 
  • Emphysema: Damaged alveoli in the lungs do not take up adequate oxygen.
  • Pneumonia: Infection causes fluid or pus buildup that affects inhalation.
  • Pneumothorax: Air in the space around a healthy lung or collapsed lung.
  • Pulmonary oedema: Fluid on your lung).
  • Pulmonary embolism: Blood clot in your lung.
  • Pulmonary fibrosis: Scarring in the lung.
  • Pulmonary hypertension.

What are the Symptoms of Low Blood Oxygen Levels or Hypoxemia?

If you're experiencing any of these symptoms, it's important to get medical attention right away.

Symptoms of low blood oxygen levels can include:

  • Shortness of breath
  • Rapid heartbeat
  • Chest pain
  • Confusion
  • Headache
  • Blue-coloured lips or fingernails
  • Fatigue

How to Check Blood Oxygen Levels From a Pulse Oximeter A2?

Checking your blood oxygen level using a pulse oximeter A2 is a simple process. Follow these steps:

  1. Press the power button to turn on the pulse oximeter A2.
  2. Insert your finger into the device, making sure it fits snugly.
  3. Wait for the device to read your pulse and display your blood oxygen level on the screen.
  4. Check the screen to see your blood oxygen level, which will be visible as a percentage. Normal readings are typically between 95% and 100%.
  5. Take note of any other readings the pulse oximeter shows such as your pulse rate.

Ensure that you are not wearing any nail polish, mehendi, or sweating when checking SpO2 levels in the oximeter.

How can I Raise My Blood Oxygen Level?

Lastly, there are also things you can do to improve your blood oxygen levels on your own. For example, quitting smoking, maintaining a healthy weight, and getting regular exercise can all help improve your respiratory health and increase your blood oxygen levels. So, take care of yourself and breathe easy!

Get Your Pulse Oximeter A2 From The Passbox

At our medical online store, we have accurate, ready-to-use oximeters. Order yours today to keep track of your health.

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